Definitely your immune system
B. Muscular Strength. I'm almost positive that's the answer.
Ruin your family life, and physical life. you will not have good friends, loose money, and everytime you drink/do drugs there is a chance that your next is your last (you dying) its very unsafe and can make you mean and irritatable when you are having a withdrawal (not good) you become desprate and might even steal to get money for more
Good but I also sus yellow, omg wait your imposter
Answer:
Well considering in this hypothetical world that the gym is the only place you burn any calories the rest of the calories will turn into fat and be stored in your body this isn't unhealthy since the average adult male needs 2500 and 2000 for females it all depends truly on your lifestyle if you sit around doing nothing then yes its unhealthy